Transformer.



0. LE G. 'FORTESGUE.

' TRANSFORMER. APPLICATION FILED NOV. 28, 1913.

Patented Feb. 23, 1915.

2 BHBETS-SHEET 1.

0% mm km \N N v M... Q \Q Q s Q s a u s s m w w w w a s s Q 8 s a m VENTOR 7147M WITNESSES 'ATTORNEY 0. LE G. 'FORTESCUE. TRANSFORMER. APPLICATION I'LLED NOV. 28, 1912.

1,129,469. Patent ed Feb. 23, 1915.

2 SHBETSSHEET 2.

: T. 12:11:37: Q Lk (Q Q WITNESSES: INYENTOR @M ATTORNEY UNITED STATES PATENT OFFICE.

CHARLES LE G. FORTESCUE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WEST- INGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

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Patented Feb. 23, 1915.

Original application filed August 2, 1909, Serial No. 510,854. Divided and this application filed November 28,

To all whom it may concern Be it known that 1, CHARLES Ln Gr. Fonrnsoun, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Transformers, of which the following is a specification, this application being a division of application Serial No. 510,854.

My invention relates to electrical apparatus, and it has special reference to the windings and insulation of transformers that are intended for use in connection with very high-voltage circuits.

The general object of my invention is to provide such a winding and such an insulating structure that the stress exerted by the voltage of the coils shall be properly distributed through the insulation with a view to reducing the space occupied by, and the manufacturing cost of, a high voltage transformer or other similar apparatus.

In application, Serial No. 510,854, of which the present application is a division, I have disclosed and claimed a transformer comprising a plurality of spaced coils and an adjacent insulating sleeve or structure having conductors embedded in it and .terminating adjacent to its ends, the coils being connected to the corresponding opposite conductors.

It is the object of the present application to cover the combination of'the coilswith an insulating structure in which only a part of the conductors are connected to the coils, the conductors that are not connected to the coils extending beyond the coils. The potentials of certain of the conductors, therefore, are fixed by the connections to the coils, whereas, the potentials of the remaining conductors are fixed by condenser action.

My invention is illustrated in the accompanying drawings, Figure l of which is a view, in side elevation and in section, (if a transformer constructed in accordance thereprises a'substantially rectangular core 1, a

low-potential winding 2 that is divided into two groups of coils which surround two op-- posite'legs 3 and 4 of the core 1 and are separated'ftherefrom by insulating sleeves 5, a

Serial No. 803,422.

primary winding composed of two groups 6 and 7- of relatively flat coils, insulating sleeves 8 and 9 located on the respective core legs between the low and high-potent1al windings, and insulating carriers 10 and 11 that insulate the high-potential windings from each other and from other adjacent parts. The core legs 3 and 4 may be of any suitable form but are preferably cruciform in cross section, in order to economize space and to reduce the mean length of turn in the winding.

The insulating sleeves 8 and 9 are similar to each other, and each preferably comprises a plurality of cylinders 13 of conducting material and insulating cylinders 14 which alternate therewith. The conducting cylinders are of graded lengths, the longer ones being adjacent to the low-potential winding,

, and the shorter ones adjacent to the highpotential winding. "The sleeves 10 and 11 are also similar to the sleeves 8 and 9, and the conductors embedded therein are also similarly arranged with respect to the coils terminal of the coil 19 which is located upon the other side of the coil 17. Circuit is similarly continued through coils 20, 2 1, 22, 23, 24, 25, 26, 27 and 28, the free terminal of coil 28 being grounded or connected to one terminal of a coil 539 of the group 7.

The circuit is continued through the coils of this group in the same wav as it was completed through the coils of the group (S, but in the reverse order, the lead 30 being finally brought out through a terminal bushing i:

By interconnecting the coils through the conducting cylinders which constitute parts of the insulating sleeves, the potentials of the said conductors are fixed and the strains imposed .upon the insulation are distributed in a manner that 1s determined by the or rule according to'which the potentials of the conductors are fixed; for instance, the potentials of the embedded conductors may be fixed at such values as to produce a substantially uniform distribution of potentialthroughout the insulating structures, or

, they may be fixed so as to cause the distribution of the potential to follow the logarithmic law, which represents the distribution of potential that would exist if the inner and outer conducting cylinders were of infinite length.

It will be noted that the insulating sleeves surrounding the core legs extend somewhat beyond the ends of the two groups of coils, and that the innermost conducting cylinders are not connected to the coils. The poten xtials of the said innermost conducting cyl- 2, two of the parts being respectively disposed outside of the two groups of high-po te'ntial windings, and the remaining parts being located inside thereofyas in Fig. 1. The advantages obtained from this arrangement are well known. 7.

When both ends of each of the trans former winding groups 6 and 7 are maintained at a'relatively high potential above the ground, the terminals 6 and 'Z, which are interconnected, are carried away from the core member through bushings 6 and 7 as shown inFig. 2,. inorder to avoid grounding.v

I claim as my invention:

1. In an electrical device, the combination with a plurality of coils, of an. adjacent insulating structure comprising interleaved insulating and conducting members, the potentials of certain of theconducting members being oond-uctively determined and those of .the remaining members-being determined by condenser action.

2. In an electrical device, the combination with a plurality of coils, of an adjacent in sulating structure comprising interleaved 1nsulating and conducting members, the potentials of certain of the conductingmembers being determined by condenser action, the portionof the structure embodying the latter conductors extending beyond the coils.

3. In an electrical device, the combination with a plurality of coilsof an adjacent insulating structure comprising interleaved insulating and conducting members, a part only of the conducting members'being connected to the coils.

4. In an electrical device, the combination with a plurality of coils, of an adjacent incence sulating structure comprising interleaved insulating and conducting members, a part 6..Anelectr1cal device comprising a plu-' rality of coils; an adjacent insulating structure having its end portions inclined relatively to the axis of the coils, and spaced conductors terminating adjacent to the inclined portions of the insulating structure, a part only of which are connected to the coils;

7. .An electrical device comprising a plurality ofcoils, an adjacent insulating structure having its end portions inclined rela-- tirely to the axis of the coils, and spaced conductors terminating adjacent to the inclined portions of the insulating structure, those nearest the coils being connected there-. to, while the remaining conductors are not connected thereto.

8. An electrical device comprising a plurality of coils, an adjacent insulating structure having its end portions inclined rela- .tively to the axis of the coils, and spaced conductors terminating adjacent to the in- -'clined portions of the insulating structure, a

part only of which are connected to the coils, the said conductors being respectively opposite to the coils to which they are connected.

' 9. An electrical device comprising a plurality of coils, an adjacent insulating structure having its end portions inclined relatively to the axis of the coils, and spaced conductors terminating adjacent to the inclined portions of the insulating structure, a part only of which are connected to the coils, the said conductors being respectively opposite .to thei-coils to which they are connected, and the portion of the structure embodying the remainin'g conductors eXtending between the coils. 10. An electrical device comprising a plurality ofcoils, an adjacent insulating structure having its end portions inclined relatively to he axis of the coils, and spaced conductors terminating adjacent to the inclined portions of the insulating structure,

a part only of which are connected to thecoils, the portion of the structure embodying the remaining conductors extending beyond the coils.

11. An electrical devicecomprising a plurality of coils, an adjacent insulating structure having its end portions inclined relatively to the axis of the coils, andspaced conductors terminating adjacent to the inclined portions of the insulating structure, only the conductors that terminate adjacent to the intermediate portion of the structure being connected to the coils.

12. An electrical device comprising a plurality of coils, an adjacent insulating structure having its end portions inclined rela- .tively to the axis ofthe coils, and spaced conductors terminating adjacent to the inclined portions of the insulating structure,

only the conductors that terminate adjacent CHARLES LE c. FORTESGUE Witnesses W. M. MCCONOHY, B. B. HiNEs. f 

